Any noble cause probably. That's actually how I want to go when I do go, but I'm definitely not going out and saving people though, I'm just saying that I would do something if something happened and I was able to help even a little bit.

Love: Heck No!
Fame: How do you sacrifice yourself for fame? Is it like "going out with a bang" or something? It can be cool but it is ultimately pointless. Famous for five minutes.
Greater Good: ...Possibly. Problem with greater good is that it's two-faced; something isn't necessarily right or true just because someone dies for it. But there are things I’m prepared to fight for.

o_O You can't exactly sacrifice your life for any sort of future personal benefit... you'd be a little too dead to enjoyit (posthumous fame, etc. not withstanding). That's probably why people usually ask what you would sell your eternal soul for... as if souls aren't a dime a dozen hehe.

Mu answer? Nothing. Very llittle good can come of sacrificing your own life for any personal causes. No matter how noble it seems, there are no guarantees that your death will mean anything. People die every day, so why should your death get special meaning? Besides, the deaths people rally behind are usually tragic accidents not second-hand suicides. That's not saying you shouldn't rush in front of a car to save a child, etc. The difference is the mentality that you have going into it... is it to save them and hopefully keep living, or to get a rockin' funeral and die as a hero?

Even if someone stuck a gun to your head and told you to choose between yourself and a friend/lover/family member/ whatever, can you really guarantee that they will be safe once you take the bullet, or are you just taking the easy way out? Death is easy. Living is hard.